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Start Over Subjects Weismann, August, 1834-1914. ✖Remove constraint Subjects: Weismann, August, 1834-1914. Authors Hertwig, Oscar, 1849-1922, author ✖Remove constraint Authors: Hertwig, Oscar, 1849-1922, author Titles The biological problem of to-day: preformation or epigenesis? : The basis of a theory of organic development ✖Remove constraint Titles: The biological problem of to-day: preformation or epigenesis? : The basis of a theory of organic development

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